'use strict';
Object.defineProperty(exports, '__esModule', {value: true});
exports.pageScrollMixin = void 0;
var utils_1 = require('../common/utils');

function onPageScroll(event) {
    var _a = utils_1.getCurrentPage().vanPageScroller,
        vanPageScroller = _a === void 0 ? [] : _a;
    vanPageScroller.forEach(function (scroller) {
        if (typeof scroller === 'function') {
            // @ts-ignore
            scroller(event);
        }
    });
}

exports.pageScrollMixin = function (scroller) {
    return Behavior({
        attached: function () {
            var page = utils_1.getCurrentPage();
            if (Array.isArray(page.vanPageScroller)) {
                page.vanPageScroller.push(scroller.bind(this));
            } else {
                page.vanPageScroller =
                    typeof page.onPageScroll === 'function'
                        ? [page.onPageScroll.bind(page), scroller.bind(this)]
                        : [scroller.bind(this)];
            }
            page.onPageScroll = onPageScroll;
        },
        detached: function () {
            var _a;
            var page = utils_1.getCurrentPage();
            page.vanPageScroller =
                ((_a = page.vanPageScroller) === null || _a === void 0
                    ? void 0
                    : _a.filter(function (item) {
                        return item !== scroller;
                    })) || [];
        },
    });
};
